I recently installed a Fidanza lightweight flyweel in my Max. Ever since then, I've noticed some interesting harmonics between 2k and 3k rpms. Depending on the temperature, I get 3 different types of noises: whirring noise (cold), something that sounds like I've got CAI (warm to operating temp) - this noise increases with load, and something that almost sounds like a manifold leak ('thumping') noise that also increases with engine load. I haven't noticed any real difference in noise when revving in neutral. Once I get over 3k it seems to go away. It seems to be coming out from around the flywheel area. Anyone else noticed this with their lightweight flywheel? Anyone have a lightweight flywheel and no noise? I've done a ton of searches, but haven't found a post describing what I'm running into.

 

I have the fidanza flywheel. No noises at all. Maybe its the clutch or throwout bearing.

 

Bump?